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A216281 as a simple table

na(n)
11
22
321
4392
511980
6471966
724655820
81548264752
9118039822488
1010482116888640
111076582148812808
12125439212178037728
1316473767684928836256
142410412979008498588208
15390793360308270931979400
1669716064087131957637475968

[1,2,21,392,11980,471966,24655820,1548264752,
 118039822488,10482116888640,1076582148812808,
 125439212178037728,16473767684928836256,
 2410412979008498588208,390793360308270931979400,
 69716064087131957637475968]